Display Voltage Generator for Line-Capacitor Compensation
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Solution Overview
Problem
Existing display devices face challenges in accurately sensing and compensating for the driving characteristics of each pixel, leading to variations in display quality.
Innovation Solution
Incorporating a sensing driver and a voltage generator that varies the first driving voltage over time based on changes in sensing voltage, using a display panel with sensing lines and isolated sub-voltage lines to compensate for deviations in line capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensing driver is used to sense sensing voltage through sensing lines, then pixel driving characteristics can be sensed, but the influence of line capacitors causes inaccurate sensing results
Solution Approach 1:
The patent changes the voltage parameter over time by applying different voltage levels (first voltage level and second voltage level) to the first driving voltage line at different time points during the sensing period. This time-varying voltage approach allows the sensing driver to distinguish between voltage changes caused by pixel characteristics and those caused by line capacitor effects, thereby improving sensing accuracy despite the presence of line capacitors.
2Device complexity
If a single first driving voltage is applied to all pixels, then device complexity is reduced, but display quality varies due to line capacitor deviations
Solution Approach 1:
The patent segments the first driving voltage line into multiple isolated sub-voltage lines, where each sub-voltage line is connected to a specific sensing line. This segmentation allows independent voltage control for different pixel groups, enabling compensation for line capacitor deviations while maintaining a relatively simple overall structure. The isolation between sub-voltage lines prevents mutual interference and enables precise local adjustment.
3Ease of operation
If voltage is held constant during sensing, then device operation is simplified, but accurate sensing of pixel characteristics cannot be achieved
Solution Approach 1:
The patent implements periodic voltage variation during the sensing period by alternating between a first voltage level and a second voltage level at different time points. This periodic action creates a time-varying sensing scheme where the pixel circuit responds differently to each voltage level, allowing the sensing driver to extract accurate pixel characteristics (such as threshold voltage) while maintaining relatively simple voltage control through repetitive patterns.
Data Source
AI summary
Disclosed is a display device including a display panel, a sensing driver, and a voltage generator. The display panel includes a sensing line, a pixel connected to the sensing line, and a first driving voltage line connected to the pixel. The pixel includes a light emitting element connected between the sensing line and the first driving voltage line. The sensing driver senses a sensing voltage through the sensing line during a sensing period. The voltage generator supplies a first driving voltage to the first driving voltage line. During the sensing period, the voltage generator varies the first driving voltage over time based on a change in the sensing voltage.